- Deposit Type: Hard Rock
- Commodity: Gold
- State/Province: UT
- Country: United States
- Latitude: 39° 56' 38'' N
- Longitude: 112° 7' 21'' W
The Main Tintic Mining District
Situated in Juab County, 70 miles SW from Salt Lake City, in the mining friendly State of Utah. The Main Tintic District ranks 4th in underground precious metals districts in the U.S. The Main Tintic underground mines are characterized as requiring minimal underground rock support, temperatures about 75 degrees, with a deep water table. 90% of production has come from large dimension replacement ore bodies in carbonate rocks, which are amenable to modern mechanized underground mining. Infrastructure including electrical and transportation are in place. Highway US-6 passes through. Union Pacific Railroad is adjacent on the west. DO NOT CONFUSE with the nearby East Tintic Mining District in Utah County—which has very different and much less favorable mining conditions. Since 1900. When the U.S. Bureau of Mines began keeping records, the Main Tintic District has produced 13 million tons of ore, from which was recovered: 208 million ounces silver; 2.2 million ounces gold; 247 million pounds copper; and 1,318 million pounds lead. No production figures are available from 1872, when mining began, to 1900. Production had ended at all Tintic District metal mines prior to 1958 as a result of low metals prices, and antiquated mining methods—not for lack of ore. Little modern exploration has been carried out, and numerous high potential ore targets remain untested. Conflicting and fragmented property ownership has negatively hampered exploration and mine development. Property ownership of major mines has now been consolidated. The Main Tintic Mining District remains a “SLEEPING UNDERGROUND GIANT.”
The Mines in Millionaire RowDuring the early 1900s. four mines on the prolific gold/silver/copper rich “Gemini Ore Run” were locally referred to as “Millionaire Row” These 4 mines on 295 acres of patented mining claims owned by GEMINI MINES LLC were the most historic productive contiguous group of mines in the entire Main Tintic Mining District, Utah. These 4 historic productive mines were the Centennial Eureka, Bullion Beck, and Eureka Hill. Combined recovered metals from these four mines were: 817 thousand ounces of gold (.30 opt); 62.7 million ounces of silver (20.2 opt.); 126 million pounds of copper (2.0%); and 318 million pounds of lead (5.1%) from 3.12 million tons of ore. These production figures were subsequent to 1900 when the U.S. Bureau of Mines began keeping records. No information is available for production between 1872 and 1900. These mines together were known as “MILLIONAIRE ROW” because of their high profitability and generous dividends. Except for small production by lessees, these mines were all closed about 1928 for general economic conditions (low metals prices) and antiquated engineering—not for lack of ore. These four mines are now offered as a group for JV by Gemini Mines LLC.
One geologic report is attached to the Gemini Mines website , which provide additional information. This report was prepared by SRK International Consultant group (2010). Information on the 4 mines of Millionaire’s Row is included in this report. Gemini Mines LLC has acquired a large number of mine maps, geologic, and production data from earlier operations, which are available for examination at Gemini Mines office at Mammoth, Utah.
Centennial Eureka (Blue Rock) MineNumber one single producer of gold and silver ores in the entire Tintic Mining District, with: 656 thousand ounces of gold (0.42 opt); 23.4 million ounces of silver (15 opt); 80 million pounds of copper (2.56%); and 20 million pounds of lead (0.64%); from 1.56 million tons of ore, subsequent to 1900. These were “recovered metals” and not total metals contained in the mined ores. Antiquated early smelting methods were inefficient. The Centennial Eureka mine dump was re-processed in 1993 and 1994. An additional 0.10 opt. gold was recovered from the mine dumps.
Noranda Mining Company carried out an underground mapping and sampling program in 1988 and determined that over 1 million tons of possable ore remains unmined in the Centennial Eureka Mine with an estimated average grade of 24 opt silver; 0.42 opt gold and 2.5% copper. Noranda did not move ahead toward production because an important portion of the mine property was owned by another company, and could not be acquired at that time. Gemini Mines LLC now owns a full 100% of the Centennial Eureka mine property. A copy of Noranda’s final report is available.
The Centennial Eureka mine has a 2,000 foot deep shaft (partially repaired) plus a 2,600 foot long haulage tunnel (Holden Tunnel) which accesses the 550 level of the Mine. The Holden Tunnel connects the mine shaft to a proposed mill site adjacent to U.S. Highway 6, and 2 miles from a loading facility on the Union Pacific Railroad. The Holden haulage tunnel remains open.
The Centennial Eureka Mine was the “Flagship Mine” for the former U.S. Smelting, Refining and Mining Company (USSR &MC). Mine-run ore from the Centennial Eureka Mine was smelted at the Midvale Smelter near Salt Lake City, and was transported from the mine to the smelter by railroad.
Bullion Beck MineOne of the highest grade major silver mines. The Gemini Ore Run is zoned. The Bullion Beck, along with the adjacent Eureka Hill, are in the high silver zone, and were the highest grade major silver producers at Tintic. The deepest workings were the 1500 level, about 100 feet above the water table. The Bullion Beck shaft remains in good condition, with the headframe repaired and replaced within the past 5 years. Metals recovered from Bullion Beck ores were: 73,000 ounces gold (0.11 opt); 16.1 million ounces silver (24.3 opt); 31.6 million pounds copper (2.38%); and 139 million pounds lead (10.5%). The ore occurs as replacements in limestone. Ore bodies are typically 30 to 50 feet wide and hundreds of feet in vertical dimension. Early operators were restricted because of property boundaries. Gemini Mines LLC has acquired additional lands to permit mine expansion, and property boundary limitations are no longer a problem. The Bullion Beck mine workings connect with those of the Centennial Eureka and Eureka Hill Mines on several underground levels. The three main shafts for these mines, as well as the Holden Tunnel, can be used together for access, ventilation and mining operations. Gemini Mines LLC has extensive underground level, and other maps, plus past production and smelter reports sufficient to permit effective modern exploration to be carried out. No underground exploration drilling has ever been done in any of the three Millionaire Row mines. Early day miners simply followed “best guesses” and mineralized veinlets to discover and develop new ore zones. Gemini management believes that modern computer modeling, geologic mapping and exploration drilling underground will develop large tonnages of high grade mineable ore, of similar grade to past production.
Eureka Hill MineEureka Hill Mine is the third mine of Millionaire Row. This mine started production shortly after its discovery in 1870. From 462,000 tons of ore (mined subsequent to 1900), this mine recovered: 83,000 ounces of gold (0.18 opt); 13.8 million ounces silver (29.9 opt); 12.2 million pounds copper (1.3%); and 50.7 million pounds lead (5.5%). The Eureka Hill shaft is 1,800 ft. deep. Ore zones are limestone replacements similar to those in the adjacent Bullion Beck Mine. The “Gem Fissure” was discovered on the 1600 level which is a karst feature. Water pumped from the Eureka Hill and adjacent mines was disposed of utilizing the “Gem Fissure.”
Gemini MineThe Gemini Mine is adjacent and north from the Eureka Hill mine and adjacent to the east from the Bullion Beck mine. The ore bodies are similar to those of the Eureka Hill and Bullion Beck mines. The ore consists limestone bedded replacements, ore channels and mineralized breccia pipes. No reliable production records are available from the beginning of mine operation in 1886 until the Bureau of Mines began keeping records in 1900. Between 1900 and 1928—the date of the mine closure—from 444,000 tons of ore, the Gemini mine recovered 5,100 ounces of gold (.01 oz/ton); 10.4 million ounces of silver (23.5 oz/ton); 2.0 million lbs. copper (0.23%); and 107.7 million lbs. lead (12.1%). The Gemini shaft was sunk to a depth of 2,000 feet, and is currently open (recent television camera) to just below 1,000 ft. The Gemini mine was closed (at the same time as most other Main Tintic District mines were closed for general economic reasons and antiquated engineering. Much potential exists for discovery and development of large tonnages of profitable (mainly) silver ores
Business OpportunityThe re-opening of these 3 mines provides an unusual profit opportunity. All production levels are above the water table. Mine workings for all 3 mines connect underground. The rock surrounding the ore bodies is strong and most underground workings are open and can be repaired for easy access. The majority of ores from these 3 mines are oxidized. Ores can be direct shipped to custom smelters, or can be processed by hydro-metallurgical methods on site. Early production can be expected with minimum capital expense, because full infrastructure is already in place. Extensive underground workings (shafts, tunnels and working levels) already exist. A massive amount of technical data is already available. The State of Utah is mining friendly, and these mines are situated in an area considered “economically disadvantaged” by the State.
Old Bonanaza Mines can Be Made New Again----Each of the “BIG 4” mines in MILLIONAIRE ROW had massive sized mine facilities, and each employed hundreds of men a century ago. In 1917 these mines were the main support for the town of Eureka (population~4,000 ). The ore bodies were never mined out—they can be “made new again.”
----The Tintic Mining District consists of an incredible concentration of gold-silver-copper and other metals. Tintic is like a “birds nest on the ground” awaiting those enterprising enough to gather up the pretty gold and silver eggs.
----Management of Gemini Mines has (for the first time) consolidated the key properties of MILLIONAIRE ROW and other mining properties in the heart of the historic Tintic Mining District. Ownership consists of patented mining claims which are “fee simple” ownership.
----Past property boundaries hampered expansion of existing mines and exploration of historically highly profitable mines. This handicap no longer exists.
----Changes in exploration and mining technology, since the days of historic production are enormous. There has been ZERO underground exploration drilling in any of the MILLIONAIRE ROW mines at Tintic. Where the “old timers” failed, the “new timers” will succeed.
----Management of Gemini Mines has acquired hundreds of historic technical and financial items, including maps, geologic reports, production records and other data that will significantly assist in the modern exploration and development.
--- The Tintic Mining District is one of those rare places on the earth’s crust where gold-silver and other metals occur in high grade commercial concentrations. Underground mining at Tintic will enable the production of high grade precious metals ores that can be direct smelted or processed on site using hydro-metallurgy. The days of pick and shovel mining, with mules pulling ore cars has at last come to an end.
ReferencesBillingsley, P. and T. Lyon, Aug. 26, 1924, Possibilities for prospecting in the Tintic district, Utah: Report to International Smelting Co.
Billingsley, Paul, and Crane, G.W., 1933, The Tintic mining district in the Salt Lake region: International Geol. Congress 16th, Washington, D.C., Guidebook 17, p.101-124.
Brown, D.R., 1989, Report on Centennial Eureka mine Tintic Mining District, Juab County, Utah: Noranda Exploration, Inc.
Cook, D.R., 1957, Geology of the East Tintic Mountains and ore deposits of the Tintic mining districts, Utah: Utah Geol. Soc. Guidebook to the Geol. of Utah, no.11, 189 p.
Crane, G.W., 1923, Geological report on the Centennial Eureka mine with a plan for its development. Private report copy in gemini mines Files
Howd, F.H., 1957, Hydrothermal alteration in the East Tintic mining district, Utah: in Cook, D.R., ed., Geology of the East Tintic Mountains and ore deposits of the Tintic mining districts, Utah Geol. Soc. Guidebook to the geol. of Utah, no.12, p.124-134.
Kildale, M.B., 1938, Structure and ore deposits of the Tintic district, Utah: Stanford University, Ph.D dissertation, 158 p.
James, A.H., 1973, Lead and zinc resources in Utah: Utah Geol. and Min. Survey, Special Studies 44, 66 p.
Levy, J., 1987, Joint venture evaluation - Tintic mining district, Utah, U.S.A.: Centurion-Western Mining joint venture report.
Lindgren, W., 1933, Mineral deposits (4th ed.): New York, McGraw Hill Book Co., 930 p.
Lindgren, W., and Loughlin, G. F., 1919, Geology and ore deposits of the Tintic mining district: Utah, USGS., Professional Paper 107.
Lovering, T.S., 1949, Rock alteration as a guide to ore - East Tintic district: Utah, Econ. Geol. Mon. 1, 65 p.
Morris, H. J., and Lovering, T.S., 1979, General geology and mines of the East Tintic mining district, Utah and Juab Counties, Utah: USGS., Professional Paper 1024.
Morris, H. T., 1964, Geology of the Tintic Junction quadrangle, Tooele, Juab & Utah Counties, Utah: USGS., Bull. 1142-L, page L1-L23.
Morris, H.T., 1968, The Main Tintic mining district, Utah: in Ridge, J.D., ed. Ore deposits of the United States, 1933-1967, Graton-Sales Volume, AIME, p.1043-1074.
Morris, H.T., and Lovering, T.S., 1979, General geology and mines of the East Tintic mining district, Utah and Juab Counties, Utah: USGS. Professional Paper 1024, 203 p.
Shepard, W.M., Morris, H.T., and Cook, D.R., Geology and ore deposits in the East Tintic mining district, Utah: in Ridge, J.D., ed., Ore deposits of the United States, 1933-1967, Graton-Sales Volume, AIME, p.941-965.
Tower, G.W., and Smith, G.O., Description of the Tintic special district, mining industry: atlas Tintic folio No.65, 4-7.
USGS. Map, 1978, Geologic map of the East Tintic mining district, Utah and Juab Counties, Utah: 1:96,000, G77009, plate #1.
Walker, R. J., 1936, Centennial Eureka Mine, correspondence with E.A. Hamilton, USSR&M Co. (Private report in Gemini Mines LLC files)
Weeks, F. B., 1923, Geological report on the Centennial-Eureka and Bullion Beck mines, correspondence to N.W. Rice, USSR&M Co. (Private Report in Gemini Mines LLC files)
Welsh, J. E., 1985, Feasibility of mining below the water table, Main Tintic. Private consulting report for Centurion Mines Corporation.